NicoK opened a new pull request #6838: [FLINK-9878][network][ssl] add more low-level ssl options URL: https://github.com/apache/flink/pull/6838 ## What is the purpose of the change This is mostly to tackle bugs like https://github.com/netty/netty/issues/832 (JDK issue during garbage collection when the SSL session cache is not limited). We add the following low-level configuration options for the user to fine-tune their system, i.e. the Flink-internal communication: - SSL session cache size - SSL session timeout - SSL handshake timeout - SSL close notify flush timeout FYI: I'll also merge this into `master` if accepted. ## Brief change log - add `security.ssl.internal.session-cache-size` and `security.ssl.internal.session-timeout` configuration parameters -> configure these for `SSLContext`s created by `SSLUtil` - add `security.ssl.internal.handshake-timeout` and `security.ssl.internal.close-notify-flush-timeout` -> configure these for `SslHandler`s created by `SSLHandlerFactory` (previously `SSLEngineFactory`) - rename/refactor `SSLEngineFactory` to `SSLHandlerFactory` since no `SSLEngine` objects alone were actually needed, but only Netty's `SslHandler` (reduces code duplication which would be worse with this PR) ## Verifying this change This change added tests and can be verified as follows: - added configuration-verification test to `NettyClientServerSslTest` ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): **no** - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: **no** - The serializers: **no** - The runtime per-record code paths (performance sensitive): **no** - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: **no** - The S3 file system connector: **no** ## Documentation - Does this pull request introduce a new feature? **yes** (kind-of) - If yes, how is the feature documented? **docs + JavaDocs**
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